“I’m seeing colour again. For so long I was in my bedroom, the lights were off, there were takeaway bags everywhere. I wasn’t talking to my friends.”

The 21 year old died in a road traffic accident [Instagram/Harriet Shelley]

George rose to fame as part of Union J [Getty]

He has now announced his BBC Three documentary in an emotional video to fans.

“It’s been 12 months now since I lost my little sister Harriet to a road traffic accident during a night out, and it has been the hardest 12 months of my life, without a shadow of a doubt," he said in the video post.

George Shelley through the years

George Shelley through the years

From X Factor to I'm A Celebrity... Get Me Out Of Here! George Shelley sure has grown up. We're taking a look at the singer through the years

“That’s why I am making a documentary with BBC Three about the grieving process and the difference coping mechanisms that are available,” the X Factor favourite revealed.

“I know a lot of young people find it difficult to talk about mental health and grief in particular, so I’m hoping that by me talking about this and making this documentary it’s going to help me get through this process but also help a lot of other people in a similar position.”